断续节理扩展算法在隧道围岩稳定分析中的应用

利用虚节理力学性质参数弱化函数，在 Jennings 强度准则基础上 提出了应用于非连续变形分析计算的断续节理强度形式；然后，将虚节理力学性质参数弱化规律和断续节理强度表达式运用于非连续变形分析计算程序中，实现了对断续节理扩展过程的模拟算法 ；并通过剪切试验计算结果与室内试验结果的比较，验证了该算法的正确性。利用该算法对节理岩体中金鸡山隧道进行了围岩稳定性分析，分析结果客观反映了节理展布特征对隧道围岩的变形影响和节理岩体隧道围岩位移分布特征，表明了断续节理扩展算法在隧道围岩稳定性分析方面具有良好的应用前景。

Application of fracturing algorithm of intermittent joints in stability of surrounding rock

According to the phenomenon of attenuation of mechanical parameters in rock failure,the strength criterion for intermittence jointed rock mass is proposed by use of the attenuation formula of virtual joint mechanical parameters based on the Jennings Criterion.The strength criterion for intermittent jointed rock mass and the attenuation formula are applied into the DDA code to complete the computation program of analyzing the initiation,extending and connecting of rock fractures,and then the validity of algorithm is verified by making comparison between the computed results and the shear test ones.At last,this algorithm is employed to analyze the stability of surrounding rock of Jingjishan Tunnel,which is a multiple-arch tunnel with eight traffic lanes.The simulated results show the influences of joint distribution features on the surrounding deformation and give the characters of surrounding displacement.It is shown that the fracturing algorithm of intermittent jointed rock mass is capable of analyzing the stability of tunnels.